Communications ports

The data logger is equipped with ports that allow communications with other devices and networks, such as:

• Computers
• Smart sensors
• Modbus Communications protocol published by Modicon in 1979 for use in programmable logic controllers (PLCs). and DNP3 outstation Distributed Network Protocol is a set of communications protocols used between components in process automation systems. Its main use is in utilities such as electric and water companies. networks
• Ethernet (CR310)
• Modems
• Campbell Scientific PakBus ® A proprietary communications protocol developed by Campbell Scientific to facilitate communications between Campbell Scientific devices. Similar in concept to IP (Internet Protocol), PakBus is a packet-switched network protocol with routing capabilities. A registered trademark of Campbell Scientific, Inc.® networks
• Other Campbell Scientific data loggers

Campbell Scientific data logger communications ports include:

• RS-232 Recommended Standard 232. A loose standard defining how two computing devices can communicate with each other. The implementation of RS-232 in Campbell Scientific data loggers to computer communications is quite rigid, but transparent to most users. Features in the data logger that implement RS-232 communications with smart sensors are flexible.
• USB Device
• Ethernet
• C terminals

USB device port

The USB device port supports communicating with a computer through data logger support software LoggerNet, RTDAQ, and PC400 - these Campbell Scientific software applications include at least the following functions: data logger communications, downloading programs, clock setting, and retrieval of measurement data. or through virtual Ethernet (RNDIS Remote Network Driver Interface Specification - a Microsoft protocol that provides a virtual Ethernet link via USB.), and provides 5 VDC power to the data logger (powering through the USB port has limitations - details are available in the specifications). The data logger USB device port does not support USB flash or thumb drives. Although the USB connection supplies 5 V power, a 12 VDC battery will be needed for field deployment.

Ethernet port

The RJ45 10/100 Ethernet port is used for IP communications. (CR310 only.)

C terminals for communications

C terminals are configurable for the following communications types:

• SDI-12
• RS-232 (0 to 5 V)

Some communications types require more than one terminal, and some are only available on specific terminals. See Communications specifications for more information.

SDI-12 ports

SDI-12 Serial Data Interface at 1200 baud. Communications protocol for transferring data between the data logger and SDI-12 compatible smart sensors. is a 1200 baud protocol that supports many smart sensors. C1 and C2 can each be configured as an SDI-12 communications port. Maximum cable lengths depend on the number of sensors connected, the type of cable used, and the environment of the application. Refer to the sensor manual for guidance.

For more information, see SDI-12 communications.

See also Communications specifications.